下述与化学反应速率有关的因素是()
A. 催化剂
B. 温度
C. 浓度
D. 活化能
It is ridiculous to deal with love in a logical way()
When prophylactic antibiotics are used in surgery, those who receive cleaning operation shall be given drugs within()hours before operation, or at the beginning of anesthesia, so that when the incisio
A. 0.5-1
B. 1-2
C. 2-3
D. 1-3
在1000 g水中溶解3 g的KI,将溶液降温至产生500 g冰时的温度是(已知水的Kf = 1.86 K·kg·mol-1,I的原子量为127,K的原子量为39)()
A. – 0.234℃
B. – 0.134℃
C. - 0.067℃
D. – 0.034℃